<!DOCTYPE HTML>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>style样式</title>
</head>

<body>
  <h2 id="con">I love JavaScript</H2>
  <p> JavaScript使网页显示动态效果并实现与用户交互功能。</p>
  <script type="text/javascript">
    var l = document.getElementById("con");
    l.style.color = "red";
    l.style.backgroundColor = "#CCC";
    l.style.display = "none";
  </script>
</body>

</html>